Aaron jacob israel



A. J. ISRAEL.

PROCESS OF LINING METAL PIPES AND THE LIKE.

APPLICATION FILED DEC. 10. 1919.

Patented Feb. 15, 1921.

Irvl/ZMZOT. 73002 Z5 AARON JACOB ISRAEL, OF JOHANNESBUBG, TRANSVAAL, SOUTH AFRICA.

PROCESS OF LINING METALPIPES AND TH E LIKE.

Specification of Letters Patent.

Patented Feb. 15, 1921.

Application filed December 10, 1919. Serial No. 343,959.

1 '0 all we ham it may concern:

Be it known that I, AARON JAoon ISRAEL, :1 British subject, residing at Moresby, 140 St. Johns road, Houghton Estate, Johannesburg, Transvaal Province of the Union of South Africa, have invented certain new and useful Improvements in Processes of Lining Metal Pipes and the like, of which the following is a specification.

The present invention has reference to the lining of metal pipes for the purpose of protecting them against corrosion or wear by acid water or other corrosive or abrasive liquid. The invention is also applicable to the lining of metal pipes which in use have become worn or pitted, for the purpose of rendering them again serviceable.

According to the present invention a lining of cementitious material is formed centrifugally within the metal pipe. Various cementitious materials may be used and satisfactory results have been attained with a concrete formed of Portland cement and sand, the consistency of the admixture being such as to readily fiow.

In carrying out the process the metal pipe is mounted in suitable apparatus for revolv ing it preferably at speed which can be varied. The ends of the metal pipe are partially closed by means providing an inward flange, and the cementitious material in admixture with water, is introduced into the metal pipe in such quantity, having regard to the length of the pipe, as to form, when set, a liner of the required thickness. The pipe is revolved at such a speed as to spread the cement evenly along and around the interior of the pipe. Thereafter the speed of rotation is increased so as to rapidly eliminate the surplus water and to cause the cement to settle. Such surplus water may be withdrawn from the opening of the pipe by appropriate method or means hereinafter described and rotation of the pipe is continued until the cement is sufficiently set to enable the pipe to be handled. In practice it has been found that the foregoing operations can be carried out in a period of approximately ten minutes. The pipe is then withdrawn from the apparatus in which it is rotated and laid aside to permit the setting of the cement to be completed.

The accompanying drawings show apparatus suitable for carrying the invention into effect.

Figure I is a perspective view partly in section of-a device for attachment to the end of the p1 e for partlally closing the same.

1 1g. I is a partly sectioned side elevation of a modified attachment.

Fig. 111 is a side elevation of a pipe rotating machine. I 7

Referring to Fig. I, 1 indicates the metal pipe which is to be'lined. For the purpose of partially closing theend of the same a halved clamp 2 is secured to the pipe at a little distance from each end.

is held in place by bolts 4 passing through the clamp 2. The disk 3 is formed with a central aperture 6 equal in diameter to the internal diameter of the liner to be formed. In the wall of said aperture 6 is formed an annular groove 7 in which is seated a split ring 8 and a recess 9 is formed to give access to the ends of the rin 8 for the purpose of removing said ring. Tn employing this device one is bolted to each end of the metal pipe, as described, with the split ring 8 in place. After the pipe has been sufficiently revolved to settle the cement, and bring the superfluous water to the interior, the rotation is stopped and the ring 8 removed by inserting a suitable tool in the recess 9 and forcing in the free ends of said ring. Re moval-of the ring 8 permits the superfluous water to escape, whereafter the rotation is continued until the cement is sufliciently set to permit the metal pipe to be removed from the rotating machine. The end closing device 2, 3 may thereafter be removed from the pipe and utilized on another pipe which is about to be lined. I In the case of a pipe having a flange at its end the disk 2 is secured directly to the said flange.

Adisk3is' positioned against the end of th pipe,

The end closing device shown in Fig. II

is designed to be used in conjunction with the regular screw socket 10, by which pipes having threaded ends are connected. The device comprises a cylindrical portion 11 externally threaded to screw in such'socket and up to the end of the pipe 1. At its outer end is formed a head 12 which is polygonal or otherwise formed for engagement of a spanner or other implement for turning it. In the said head is formed the groove 7 in which is seated the split ring 8 described in connection with Fig. I. The internal .diameter of the part 11 and of the aperture 6 is made equal to the internal diameter of the liner desired and the ring 8 is, as before, of somewhat smaller internal diameter.

While it is obvious that many different kinds of apparatus may be employed for rotating the pipe, that shown in Fig. III haschucks are arranged to grip the metal pipes and are preferably self centering chucks, as shown. The mandrel 18 of the head stock is provided with means for rotating it, suchasthe belt pulley 20.

"In .usin the machine the pipe is passed through t e two hollow chucks so as to project, to a reasonable extent beyond the end of each, and the chucks are then tight- 'e'ned up after the tail stock has been traversed to a suitable position along the bed 13, .The hollow mandrel 18 of the head stock, is then rotated, so rotating the pipe g and with it the mandrel of the tail stock.

I claim-' 1. The process of lining metal pipes with cementitious material, which consists in partly filling the pipe with a mixture of cementitious material and water of such consistenc as to readily flow; preliminarily rotating t e-pipeat relatively low speed to spread the cementitious material around and along the interior of the pipe; and then rotating the pipe at relatively high speed to remove the surplus water from the comen-- titious material and set the lining.

2. The process of lining metal pipes with cementitious material, which consists in partially closing the end of the pipe to be lined; partly filling the pipe with a mixture of cementitious material and water of such consistency as to readily flow; preliminarily rotating the pipe at relatively low speed to "spread the cementitious material aroundand along the interior of the pipe; and then rotating the pipe at relatively high speed to remove the surplus water from the cementitious material and set the lining.

In testimony whereof I afiix my signature.

AARON JACOB ISRAEL. 

